Why is my gmc idling rough why does it shake and turn off?

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I'm sorry to hear you're having trouble with your Envoy. A rough idle, shaking, and stalling can be caused by several issues. It could be a problem with the fuel system, such as a clogged fuel filter, a failing fuel pump, or dirty fuel injectors. Another possibility is a vacuum leak or a malfunctioning idle air control valve, which helps regulate engine idle speed. If you're experiencing jolting and the need to press hard on the accelerator, it could be related to a misfire, possibly caused by faulty spark plugs, ignition coils, or even a malfunctioning mass airflow sensor. You might also want to check the throttle body and air filter for blockages or dirt. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!